Abstract Background Sequence comparisons make use of a one-letter representation for amino acids. the necessary quantitative information being supplied by the substitution matrices. This paper deals with the problem of finding a representation that provides a comprehensive description of amino acid intrinsic properties consistent with the substitution matrices. Results We present a Eu... http://www.jmannino.com/mega-choice-Rose-Gold-Herringbone-iPhone-13-Pro-MagSafe-Case-p93485-limited-save/